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Pàgina inicial > Articles > Articles publicats > Switching acidic and basic catalysis through supramolecular functionalization in a porous 3D covalent imine-based material |
Data: | 2019 |
Resum: | Non-covalent inclusion of small acid and base molecules (CHCOOH and NEt) in an imine structure based on micrometre COF-300 crystals and amorphous nanoparticles results in the facile modulation of their acid-base properties. Such a strategy results in the triggering of acidic/basic catalytic activity of the otherwise inactive materials towards ring-opening epoxide and Knoevenagel condensation reactions. For both reactions, amorphous nanoparticles are better catalysts than micrometre crystals as they exhibit a higher external surface area. The found activities and stability of this supramolecular functionalization are modulated by confinement effects, which are rationalized with the help of DFT calculations. All results obtained suggest that the reactions catalysed by these functionalized materials occur confined to pores closer to the material surface, which makes size-discrimination phenomena possible, and explains the major activity of the nanoparticulated material. |
Ajuts: | Ministerio de Economía y Competitividad RTI2018-095038-B-I00 Ministerio de Economía y Competitividad CTQ2017-89132-P |
Nota: | Altres ajuts: European Structural Funds (S2018/NMT-4367). Generalitat de Catalunya (SGR XSM is grateful for the Professor Agregat Serra Húnter position). R. C. thanks to CAM for the "Atracción de Talento" fellowship. |
Drets: | Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Acid-base property ; Amorphous nanoparticles ; Confinement effects ; External surfaces ; Functionalizations ; Functionalized materials ; Knoevenagel condensation ; Material surface |
Publicat a: | Catalysis science & technology, Vol. 9, issue 21 (Nov. 2019) , p. 6007-6014, ISSN 2044-4761 |
Postprint 10 p, 1.1 MB |